Hello,
We observed multiple NullReferenceExceptions when extracting from different files and would be happy when you fix them to make GroupDocs.Search more reliable.
1. .doc file
at \u0006\u001A\u0018\u0015.\u0008()…...Data.ContainerItem.OpenParser(LoadOptions...\u0002) at GroupDocs.Parser.Data.ContainerItem.OpenParser(LoadOptions...